Hereby a tutorial to connect an MCP2515 based CAN bus interface to an OrangePi 3 running successfull with Buster minimal nightly with 5.3 kernel. It uses the attached user overlay only and doesn’t need any other overlay.
Connections
CAN module
OPi3
26 pin header
Raspberry
CAN interface
40 pin header
Vcc 3.3
CON12-P01
1
Gnd
CON12-P06
6
MOSI
CON12-P19
19
MISO
CON12-P21
21
CLK
CON12-P23
23
CS
CON12-P24
24
INT
CON12-P26
22
Optional 5V for
Transceiver
on cheap
Chinese modules
CON12-P02
Not used
when
equiped
with a
3.3V transceiver
Add the attached overlay with the command:
sudo armbian-add-overlay spi-h6-mcp2515.dts
The file /boot/armbianEnv.txt now contains a line:
user_overlays=spi-h6-mcp2515
Reboot the OrangePi 3
Check if the MCP2515 is recognized:
pi@orangepi3:~$ dmesg | grep mcp
If properly connected it should return a line containing:
mcp251x spi1.0 can0: MCP2515 successfully initialized.
As stated a can0 interface should be generated check it with:
pi@orangepi3:~$ sudo ifconfig -a
Bring up the network:
sudo ip link set can0 up type can bitrate 250000
Check if the interrupt is hooked:
cat /proc/interrupts
should return a line like this
46: 1 0 0 0 sunxi_pio_edge 8 Edge mcp251x
Check for traffic on the CAN bus with candump from can-utils (sudo apt-get install can-utils)
candump can0
spi-h6-mcp2515.dts
